Choose the best option to complete the following sentences.

Scientists have tried to assess the impact of human activities on the environmental.

Mark the letter A, B, C, or D on your answer sheet to indicate the word that has the underlined part pronounced differently from the others.

Mark the letter A, B, C or D on your answer sheet to choose the word whose underlined part is pronounced differently from the rest.

Choose the word that has the underlined part pronounced differently from the others.

Find the word whose main stress is different from the others.

Choose the word whose stress is put differently from that of the others.

Choose the best option to complete the following sentences.

_________ will lead to the extinction of rare animals due to the loss of their habitats, and extreme floods and land erosion.

Choose the best option to complete the following sentences.

Since the appearance of electronic devices, lessons have become more and more _____ and effective.